Rod or wire drawing block



April 29,1930. F. H. NULLM EYER ROD OR WIRE DRAWING BLOCK 'Filed 00%;.21 1924 INVENTOR Patented A r. 29, 1930 1,756,206

UNITED STATES PATENT OFFICE FRANK H. NULLMEYER, F STRU'IHERS, OHIO 30])OR WIRE DRAWING BLOCK 7 2' Application filed October 21, 1924. SerialNo. 744,895. I

The present invention relates to means for to a grip device 12 and atits other end to a drawing rods or wire through reducing bolt 13 whichis secured in the sheave and means. Ordinarily, the method of drawingtraverses the peripheral groove 8. This chain v rods or, wire consistsin pointing the rod or normally extends through an opening 14 in wiresoithat a short end of the same will pass the annular wall 5. A coilspring 15 lies in a 5 I through the reducing die and fastening a portionof the groove 8 and is fastened at one puller to this projecting end andpulling a end to a pin 16 secured in the annular space few'inches of therod or wire through the between the periphery of the sheave and thereducing means and then making another inner surface of the wall 5. Thisspring is 10 grip close to the reducing means, repeating secured at itsother end to the bolt 13. Fasso this operation until a suflicient lengthof the toned to the upper surface of the sheave by rod or wire has beenpulled through the remeans of a screw 17, and also by means of the'ducing means to reach from the reducing bolt 13, is a stop'member 18which projects means to the drawing block, where it is fasinto the pathof a stop member 19 projecting 1 tened to the same with a vise or clamp.This from the inner surface of the annular wall o. operation consumesconsiderable time and Pivotally mounted upon the upper surface laborbefore the block can be set in'motion to of the sheave is a pawl 20adapted to engage draw the remainder of the rod or wire in a notch 21 inthe washer 9. through the reducing means. The operation of the abovedescribed con- 20 Th nt i ti o id a on tru structlon is as follows: Therod or wire 22 tion which eliminates this repeated gripping having beenpointed to pass through the reof the pointed end of the rod or wire andtakes ducing means 2, the grip device 12 is atcare of the slack producedin thecoil of rod tached to the pointed end 23 thereof by the or wire asit winds up on the block. Furtheroperator pulling the grip device andchain 11 25 more, the construction is such that the breakthrough, theopening. 14 in the wall 5 of the age of rods or wires due to the suddenstrain block, thereby rotating the sheave 7 on th exerted thereon instarting up the block is hub 6 and elongating the spring 15. Thisgreatly reduced, thereby increasing the outrotation of the sheave is'ina direction opput of rods or wire per block. posite to the direction inwhich the block 3 30 In the accompanying drawings rotates when drawingthe rod or wire through Figure 1 is a plan vlew, partly in section, thereducing means. The pawl 20 is so loof a preferred form of theinvention, cated with reference to the notch 21 in the Figure 2 isatransverse vertical section on washer 9 that the pawl can be turnedinto the line II-II of Figure 1, engagement with said notch before thestop 3 Figure 3 is a detail sectional view on the 18 engages the stop19. The parts are then line III-III of Figure 1, and in the positionillustrated in vFigure 1. It Figure 4 is a perspective view of anelewill be apparent that the pawl cooperating ment of the construction.with the washer prevents reverse rotation of In the illustratedembodiment of the inthe sheave by the spring 15. However, when 40vention the reference numeral 2 designates a' the block 3 is engagedwith its driving means reducing die and 3 a rotary drawing block. andbegins to rotate, the initial rotation of The drawing block is mountedon a drive the block will cause the spring 15 to be further shaft 4 andhas an annular tapered wall 5 elongated until the stop 19 engages thestop about which a rod or wire is adapted to be 18. It will be seen,therefore, that during 45 wrapped. J ournaled on the hub portion 6 ofthe initial rotation of the block the pulling the block and within theannular wall is a force is yieldingly transmitted from the block sheave7 having a peripheral groove 8 thereto the grip device so that thedanger of breakin. This sheave is held in position on the hub ing therod or wire due to sudden strain put by a plate washer 9 secured to thehub by upon the rod or wire is greatly reduced.

59 bolts 10. A chain 11 is connected at one end. Afterthe stop 19 hasengaged th stop 13 1.00

subsequent rotation of the drawing block causes the pulling force to bepositively transmitted to the grip device through the chain 11. The pawlwill be turned into inoperative position after the stop 19 has come intoengagement with the stop 18. After a few turns of the rod or wire havebeen wrapped on the wall 5 thepulling force will then be transmitted tothe grip device through the rod or wire itself and the spring 15 willthen function to rotate the sheave on the hub 6 in the same directionthat the block is rotating in to draw in the grip device and wrap thechain 11 in the groove 8. This retracting means may be limited by reasonof the stop engaging member 18 coming into contact with a second stopmember on the block, similar to the stop member 19, but spaced from suchmember; s

It will be apparent that the parts required to adapt the presentinvention to drawing blocks of usual construction are few, very simpleand inexpensive. The pawl 20 and notch 21 in the plate 9 will benecessary only on blocks which run very freely on their pivots orshafts, or where the tension of spring 15 is greater than necessary torevolve sheave 7 to take up the slack produced in the rod or wire whilebeing drawn, or where the spring tension would be sufficient to revolvethe block 3 in the opposite direction from that in which it runs to drawthe rod or wire.

While I have shown and described a preferred embodiment of theinvention, it will be understood that the invention is not limited tothe exact details of construction shown but may be otherwise embodiedwithin the scope of the appended claims.

I claim: V

1. The combination with a rotary drawing block having an annular wall onwhich to wrap a rod or wire and a grip device. of a sheave rotatablymounted within said wall and having a peripheral groove therein, arelatively unyielding element connected at one end to said grip deviceand at its other end to said sheave, said wall having an opening thereinthrough which said element passes, a coil'spring lying in a portion ofsaid groove and connected at one end to said block and at its other endto said sheave. and means whereby when said block is rotated to pull arod or wire through reducing means said sheave is caused to rotate withsaid block. said spring being adapted after the rod or wire has beenwrapped on said wall sufiiciently to cause the pulling force to betransmitted through the rod or wire itself to rotate the sheaverelatively to the block to draw in the grip device and take up the slackin the rod or wire, substantially as described.

2. In awire drawing mechanism, a draw ing block, a drive shaft for theblock, a sheave member in the drawing block concentric thereto andrelatively rotatable therein, a

to the block member in a direction opposite the normal direction ofrotation of the block in drawing wire, releasable means for holding thesheave member against rotation after the sheave has been rotated toplace the yieldable connection under tension, and cooperating abutmentson the block and the sheave member for positively transmitting motionfrom the block to the sheave member after there has been a predeterminedrelative movement between the block and the sheave member, saidabutments being so positioned as to be out of contact in the startingposition of the drum, whereby the spring is placed under further tensionat the beginning of the drawing operation.

3. In a wire drawing mechanism, a drive shaft, a drawing block fixedthereon, a grip device, a member rotatable within said block, ayieldable connection between said member and said block tending torotate the member in the same direction that the block is r0- tated indrawing the metal, a flexible connector between the grip device and saidmember, cooperating stops on said block and said member for effectingrotation of the member with the block, said stops being normally out ofengagement whenthe block is stationary whereby a relative movementbetween the block and the said member may occur upon initial rotation ofthe block, and a self-releasing latch for limiting rotation of saidmember by said yielding means in the direction of rotation of the blockto prevent rotation of the member relatively to the block in p thedirection of rotation of the block until block, a resilient connectionbetween the block and the member, a pawl on such member, a ratchet diskon the drive shaft having a notch therein for cooperation with the awl,said pawl and ratchet being provided or releasably holding the resilientconnection under tension when there has been a predetermined relativemovement between the member and the block, cooperating driving means onthe member and the block which are normally out of contact when theblock is stationary and when the pawl is engaged in the notch of theratchet disk whereby a relative movement of the block with respect tosaid member will occur when the block is initially rotated, and agripping device flexibly connected tothe relatively movable member.

5. In a wire drawing mechanism, a drawing block, a drive shaft for theblock, a relatively movable member associated with the block, aresilient connection between the blockand the member, a pawl on suchmem-I her, said pawl being adapted to be disengaged said member will occurwhen the block is v initially rotated, and a gripping device flexiblyconnected to the relatively movable memfrom the notch by such relativemovement of the block with respect to said member, the relativelymovablemember being concentrically rotatable in the block.

6. A paratus for drawing wire comprising a b ock,.a chain having a wiregripping chuck, a retracting means for the chain within the block, andto which the chain is attached, a block engaging portion ontheretracting means, said retracting means being movable ,from a positionwhere the chain is retracted to a position where the chain is fullyextended, means on the block for cooperation} with the blockengaginportion ofthe retif'actin means when the c ain is fully extended, an aholding member for releasably retaining the retractingmeans between thetwo positions.

7, A' paratus for drawing wire comprising a h ock, a chain having a wiregripping I chuck, a retracting means for the chain within the block andto which the chain is attached, a block engaging portion on theretreating means, said retracting means being movable from a positionwhere the chain is retracted to a position where the chain is fullyextended, a spring for yieldably opposing themovement of the retractingmeans 2 to the fully extended position, and for returning the retractingmeans to a position where the chain is retracted, means on the blockadapted toengage the block engaging 1 portion of the retracting meanswhen the chain is full extended, whereby motion is transmitted rom theblock to the retracting means, and aholding mechanism for. retaining theretracting means between the said two pQsitions.

8. Apparatus in the block and to which the chain is at tached, a blockengaging portion on theretractii means, said retracting means beingmovabe from a position where the chain is retracted to a position wherethe chain is fully extended, a spring for yieldahiy opposing themovement of the retraoti means to the fully extended position, as for refor drawing wire'comprising a block, a chain havin a wire grippingchuck, a retracting means or the chain withturning the retracting meansto a position where the chain is retracted, means on the block adaptedto engage the block engaging portion of the retracting means when thechain is full extended, whereby'motion is transmitted rom the block tothe retracting means, and a holding mechanism for retaining theretractin means between the said two positions, 'sai holding means beingselfreleasing upon movement of the *retracting means to the positionwhere the chain is fully extended. Y

9. Apparatus for drawing wire comprising a block, a chain having a wiregripping chuck, a retracting means for the chain comrisinga memberrotatably mounted in the lock and to which the chain is connected, astop engaging means on said member, a pair of spaced stops on the blockfor cooperation with the stop engaging means onjsaid memher, saidmember'being rotatable between the stops from a position where the chainis retracted to a position where the chain is fully extended, a springfor yieldably opposing within the limits of the stops any'rotation ofthe member from a POSItiOD WhGIG the chain is retracted and forreturning the memher to a position where the chain is retracted, and aholding mechanism for retaining the said member in a position where thesto engaging means is out of contact with th my hand. N

FRANK H. NULLMEYER.

